drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c

   1 /*
   2  * Copyright 2012 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * based on nouveau_prime.c
  23  *
  24  * Authors: Alex Deucher
  25  */
  26 #include <drm/drmP.h>
  27
  28 #include "amdgpu.h"
  29 #include <drm/amdgpu_drm.h>
  30 #include <linux/dma-buf.h>
  31
  32 struct sg_table *amdgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
  33 {
  34         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  35         int npages = bo->tbo.num_pages;
  36
  37         return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
  38 }
  39
  40 void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj)
  41 {
  42         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  43         int ret;
  44
  45         ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
  46                           &bo->dma_buf_vmap);
  47         if (ret)
  48                 return ERR_PTR(ret);
  49
  50         return bo->dma_buf_vmap.virtual;
  51 }
  52
  53 void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  54 {
  55         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  56
  57         ttm_bo_kunmap(&bo->dma_buf_vmap);
  58 }
  59
  60 struct drm_gem_object *
  61 amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
  62                                  struct dma_buf_attachment *attach,
  63                                  struct sg_table *sg)
  64 {
  65         struct reservation_object *resv = attach->dmabuf->resv;
  66         struct amdgpu_device *adev = dev->dev_private;
  67         struct amdgpu_bo *bo;
  68         int ret;
  69
  70         ww_mutex_lock(&resv->lock, NULL);
  71         ret = amdgpu_bo_create(adev, attach->dmabuf->size, PAGE_SIZE, false,
  72                                AMDGPU_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
  73         ww_mutex_unlock(&resv->lock);
  74         if (ret)
  75                 return ERR_PTR(ret);
  76
  77         return &bo->gem_base;
  78 }
  79
  80 int amdgpu_gem_prime_pin(struct drm_gem_object *obj)
  81 {
  82         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  83         int ret = 0;
  84
  85         ret = amdgpu_bo_reserve(bo, false);
  86         if (unlikely(ret != 0))
  87                 return ret;
  88
  89         /* pin buffer into GTT */
  90         ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
  91         amdgpu_bo_unreserve(bo);
  92         return ret;
  93 }
  94
  95 void amdgpu_gem_prime_unpin(struct drm_gem_object *obj)
  96 {
  97         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  98         int ret = 0;
  99
 100         ret = amdgpu_bo_reserve(bo, false);
 101         if (unlikely(ret != 0))
 102                 return;
 103
 104         amdgpu_bo_unpin(bo);
 105         amdgpu_bo_unreserve(bo);
 106 }
 107
 108 struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
 109 {
 110         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 111
 112         return bo->tbo.resv;
 113 }
 114
 115 struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
 116                                         struct drm_gem_object *gobj,
 117                                         int flags)
 118 {
 119         struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
 120
 121         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
 122                 return ERR_PTR(-EPERM);
 123
 124         return drm_gem_prime_export(dev, gobj, flags);
 125 }